Temperature compensator



-Aug.-8, 1939. n c. A. DE :sumsn 2,168,397

' TEMPERATURE coMPENAToR Filed May 21,- 19:57

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a. 'i AEAITQR Patented Aug. 8, 1939 PATENT or-Fics TEMPERATURE COMENSATOB 'Clarence A. de Giers, Long Island City, N. Y., as-

aignor to The Liquidometer Corporation, Long Island City, N. Y., a corporation .of Delaware Application my 21, 1937, semi No, 143,949 t s clam (01; liu-54.5)v

Thisinvention pertains to remote control apparatus of the hydraulic type as shown broadly in my Patent No. 1,804,212, dated May 5, 1931.

That patent discloses a pair of Sylphons forming a driving unit, another pair of Sylphons forming a driven unit, and a oating link associated with either one of said units ln order to compensate for changes of temperature.

Another of my patents, No. 1,881,266, dated Ocl0` tober 4, 1932, discloses a modified arrangement of the above in which the temperature compensating device is not associated directly with either the driving or driven units, but comprises a third pair of Sylphons with the floating link between them, these compensating Sylphons being in a pipe line forming a choke-controlled bridge or by-pass between the two transmission pipe lines which interconnect the driving and driven units.

An object of the present invention is to improve the arrangement of Patent 1,881,266 by placing the Sylphons of the compensating unit directly in the transmission lines between the driving and driven units instead Aoi* placing those Sylphons in a by-pass line. This arrangement means that the Sylphons of the temperature compensating unit are subjected to all changes of pressure in the main pipe lines. Some of these changes make sudden surges of pressure which might cause temporary buckling of the Sylphons and folding 30 of the compensating linkage if:y the arrangement of parts were of the familiar previous types.

In previous arrangements of the compensating Sylphons they were sometimes in direct axial alignment as in Patent 1,804,212, in which case the connections from the single oating arm to the Sylphons. were oi! the axial line of the Sylphons and therefore axially unbalanced forces were placed on the Sylphons, which might, under certain conditions, cause the Sylphons to tem- 40 porarily buckle sidewise. Another arrangement was to place the compensating Sylphons on offset but parallel axes (as in Patent 1,881,266) so that the studs connected to the floating link were on the center lines of respective Sylphons, thus preventing oiset axial loads on the Sylphons.

An object of the present invention is to provide a linkage for the compensating unit which will prevent oiset axial loads on the Sylphons, which will not fold up even under sudden surges of pressure, and which .will permit the Sylphons to be placed in axial alignment.

4These features enable the invention to accomplish another of its obiects. i. e., a temperature compensating unit of the least possible over-all diameter, thereby permitting the unit to be passed through small openings, and to be drawn through comparatively small pipes, thereby greatly facilitating installation in dimcult locations, as, for instance, in submarines,- where these instruments are used extensively. 5

Further and ,other objects and advantages will be apparent from the speciiication and claims and from the accompanying drawing which illustrates what is now considered the preferred embodiment of the invention. l0

Fig. l is a diagrammatic representation of the invention. j Fig. 2 is a longitudinal sectional view of a commercial embodiment of the invention.

Fig. 3 is a view on line 8-3 of Fig. 2. l5 Fig. 4 is a view on line 4-4 of Fig. 2.

Referring to Fig. 1 of nie drawing, the invenif tion is shown diagrammatically but with sulcient detail to enable the invention to be fully understood.

The unit at one end of the system is designated A and the one at ythe other end B. Movement may be transmitted from A to B or from B to A.

Each unit comprises a pair of similar uuid-tight containers of variable capacity. v These contain- 25 ers' are preferably in the form of Sylphons 30 and I2 in unit A and 84 and 38 in unit B. The Syll phons of each pair are supported in axial alignment, the outer ends of the Sylphons being rigidly mounted on frame plates 40, 42, 44 and 46while 30 l the free ends of each pair are interconnected by ibars 50 and 52.

A pointer 54 in unit A, fulcrumed on the frame at 55 and pivoted on bar 58 at 58 serves to indicate on chart any horizontal movement of barl 35 50'. Arcuate movement of pivot 58 is permitted by the exibility of the Sylphons.

- In similar manner a pointer 64 in unit B serves to indicate on chart 10 any horizontal movement 0f bar 52. 40

Between units A and B is a compensating unit C comprising a pair of similar Sylphons 16'and 18 arranged on the same axial line. Their outer ends are fixedto frame plates 80 and 82, while their adjacent ends, instead of being rigidly in- 45 terconnected as in units A and B, are connected by studs 84 and 86 to the ends' of rock-arms 88 and 80, respectively.' Arms 88 and 88 are pivoted on a xed axis at 82. 'I'he ireeend of arm 88 is connected by link 8'4 to Sylphon 18 and the free 5'0 end of arm 80 is connected by link 98 to Sylphon 18. In other words. the upper ends of arms 88 .and 80 are connected to Sylphons 16 and 18, re-

spectivelyl by studs 84` and 88, while the lower ends of arms 88 and Ware connected by links 94 55 and 36 to Sylphons 16 and '|6, respectively. Ihis arrangement insures that any axial pressure on Sylphon '|6 is transmitted to or from that Sylphon equally through stud 64 and link 06, while any axial pressure to or from Sylphons 'I6 is transmitted through studs 36 and link 34. Since studs 84 and 66 and links 34 and 06 are at equal distances radially from the axial line of Sylphons 16 and 16, there can be no unbalanced axial forc transmitted from one oi' those Sylphons t0 the other and consequently there can be no force couple tending to buckle the Sylphons sidewise.

As shown inFlg. l, the ilxed end of Sylphon is connected by pipe or tube |00 to the nxed end of Sylphon 16, which in turn is connected by pipe 02 to the iixed end oi' Sylphon 34. In like manner the ilxed end oi Sylphon 36 is connected by pipe |04 to the xedend of Sylphon 16, which in turn is connected by pipe |06 to the iixed end of Sylphon 32.

With the above structure in mind, operation of the apparatus will be readily understood. Ii', for instance, pointer 54 oi unit A be moved to the left, Sylphon 30 will be forcibly contracted axially, andSylphon 32 forcibly expanded axially bybar 50 through the instrumentality of pivot 50. Contraction of Sylphon 30 will force oil from Sylphon 30 through tube |00, through Sylphon 62 and through pipe |02 into Sylphon 34 of unit B, expanding Sylphon 34. At the same time, Sylphon 32 will be expanded axially, drawing oil from Sylphon 36 through pipe |104, Sylphon 16 and pipe |06 and cause Sylphon 32 to lengthen axially in proportion to the axial shortening of Sylphon 30. Brieiiy, then, the free ends of Sylphons 30 and 32 move a certain distance to the l left and synchronously the free ends of Sylphons 34 and 36 move to the right, causing pointer 64 to move to theV right the same distance that pointerv 54 has moved to the left'.

When a change of temperature occurs. the voiume of oilcontained in the system will expand or contract andthis change of volume of the iluid causes Sylphons 16 and 16 of unit C to both expandA or both contract equal amounts axially, both pipe lines containing the same amount ot liquid and. there being no other place in the system to accommodate the volume change. The expansion or contraction of Sylphons 'I6V and 18 -simply causes arms 66 and 30 to swing idly about their Iulcrum'point 32 without having any eiect on the functioning of the system or the relative positions oi' pointers 54 and 64.

In the commercial embodiment of the expansion unit illustrated in Figs. 2, 3 and 4, a frame ||0 is provided having brackets ||2, ||4 at its ends to support Sylphon end plates 60, 02, respectively, and having brackets ||6, ||0 for supporting fulcrum pin 32. The outer surface oi! frame ||0 is cylindrical, to nt snugly within tube |20, passages -being provided in frame H0 for tubes |00 and |04 (Fig. 4).A Frame ||0 is held in place within tube |30 by internal caps |22, |24 (Fig. 2) having central Wenings for wires |00 and |06 at one end of the device and for wires 02 and |04 at the other end.

It is4 to be understood that' the invention4 is not limited to the speciiic embodiment herein illustrated and described, but may be used in other ways without departure from its spirit as deiined by the following claims.

I' claim:

l. A movement transmitting apparatus comprising, in combination, a pair of movable devices remote from each other, a hydraulic transmission system comprising. two pipe lines interconnecting said devices whereby movement of one device will cause synchronous movement of the other. a Sylphon directly connected in each o! said pipe lines and subjected to all changes of pressure in said pipe lines, said Sylphons being in adjacent, axial alignment and being operatively interconnected through a" pair of pivoted arms and linkage whereby means is provided for preventing oiset axial loads on said Sylphons andfor preserving accuracy of the'apparatus when change of temperature occurs.

2. A movement transmitting apparatus comprising, in combination, a pair of movable devices remote from each other, a hydraulic transmission system comprising two pipe lines interconnecting said devices whereby movement oi one devce will cause synchronous movement of the other, a. Sylphon directly connected in each of said pipe lines and subjected to all changes of, pressure in said pipe lines, said Sylphons being in adjacent axial alignment and being operatively interconnected through a pair of pivoted arms. each arm being connected at its ends to one of said Sylphons whereby means is provided for preserving accuracy of the apparatus when change of temperature occurs.

3. A movement transmitting apparatus comprising, in combination, -a pair of movable devices remote from each other, a hydraulic transmission system comprising two pipe lines interconnecting said devices whereby movement of one device will cause synchronous movement of the other, a Sylphon directly connected in` each ot said pipe lines and subjected to all changes oi' pressure in said pipe lines, said Sylphons being in adjacent axial alignment with their remote ends xed land their adjacent ends interconnected through a pair of pivoted arms and linkage for preventing o'set axial loads on said Sylphons, and wherebyl all points of connection between the arms and Sylphons are equidistant from the-axial line of said Sylphons. Y

CLARENCE A. nr GlERS.- 

